42 RATHBUN 



number, all movable, and situated, 3 to 5 on the carapace, and the re- 

 mainder on the basal half of the rostrum. Posterior spine just in front 

 of middle of carapace. Inferior spines 6 or 7, rigid. Distal two thirds 

 of rostrum ascending ; tip trifid. 



Outer margin of acicle slightly arcuate, blade truncate at tip, spine 

 stout, reaching to or beyond the end of blade. 



The outer maxillipeds may fall short of or exceed the scale. Carpus 

 of right foot of second pair divided into 20 to 28 segments, of left foot 

 into about 74 segments. 



Dactyli of last three pairs short, being contained from five and a half 

 to seven and a half times in their propodi. Last pair reaching end of 

 acicle or beyond. 



No median spines on abdomen; third segment produced moderately 

 backward at the middle, margin broadly rounded at that point. Lateral 

 aculei of telson 5 to 7. 



Dimensions, — Female, station 2842, length 104 mm., length of cara- 

 pace and rostrum 48.5 mm., of rostrum 30.2 mm. 



The largest specimen on the Pacific coast was taken off Point Arena, 

 California, in 239 fathoms. It measures no mm. long, carapace and 

 rostrum 53 mm., rostrum 34 mm. 



Distribution, — From Bering Sea to Point Arena, California, 3-351 

 fathoms. 



Taken by the Albatross at the following localities : 

 Off Pribilof Islands, 25-184 fathoms, stations 3482-3491, 3494, 3496, 



3497, 3500, 3504, 3505, 3536, 3540, 3544, 3552, 3554, 3558-3561, 



3602, 3605, 361 1, 3637. 

 Off Rat Islands, Aleutian Islands, 55 fathoms, station 3599. 

 Off Unalaska, 59-351 fathoms, stations 3236, 3315, 3317, 3319, 3330, 



3331. 



Pumicestone Bay, Unalaska, 35-54 fathoms, stations 3321, 3322 (i quart 

 rejected at each station). 



Iliuhuk Harbor, Unalaska, 85 fathoms, station 331 1. 



Off Akutan Island, 36-91 fathoms, stations 2842 (type locality, abun- 

 dant), 3546, 3548. 



Off south entrance to Akutan Pass, 45 fathoms, station 2843. 



Northwest of Unimak Island, 43-70 fathoms, stations 3258, 3262. 



Unimak Pass, 34-56 fathoms, stations 3220, 3222, 3223. 



Northeast of Unimak Island, 38 fathoms, station 3265. 



Davidson Bank, 42—43 fathoms, stations 2845, 3215- 



South of Unimak Island, 42—61 fathoms, stations 3216, 3217. 



Southwest and south of Sannak Islands, 38-44 fathoms, stations 2846, 

 3213, 3214 (abundant). 



North of Amak Island, 39 fathoms, station 3273. 



Off Kudobin Islands, 36-53 fathoms, stations 3279, 3281, 3282. 



